Eugene w



(No Model.)

B. W. APPLEGATE. r INGANDESGENT ELECTRIC LAMP.

N0. 487,360. Patented Dc. 6,1892.

UNrrED ST TES PATENT OFFICE.

EUGENE WV. APPLEGATE, OF OMAHA, NEBRASKA, ASSIGNOR TO THE APPLE- GATE ELECTRIC LIGHT AND POWER COMPANY, OF CHICAGO, ILLINOIS.

INCANDESCENT ELECTRIC LAMP.

$PEGIFICATION forming part of Letters Patent No. 487,360, dated December 6, 1892.

Application filed February 29, 1892. Serial No. 423,307. (No model.) I

To all whom it may concern.-

Be it known that I, EUGENE WV. APPLEGATE, of Omaha, in the county of Douglas and State of Nebraska, have invented certain useful Improvements in Incandescent Lamps; and I do hereby declare that the following is a full,

- novel improvement in incandescent lamps.

The object of this invention is to provide an incandescent lamp that shall be so constructed that the carbon filaments may be renewed when broken or consumed without sacrificing the glass bulb, as will be described more fully hereinafter.

In the accompanying drawings, Figure 1 shows a longitudinal sectional viewof a lamp embodying my invention; Fig. 2, a sectional view of the head with the lamp removed. Fig. 3 is a top view of the cap. Figs. eand 5 show the connecting-arms; Fig. 6, the springcollar, and Fig. 7 a broken view of a modification of the bulb-stock.

A represents a pear -shaped glass bulb which is provided with a stem-opening and the flange-stock B. This stock is considerably thicker than the bulb, is circular, and provided on top with a semicircular bead B. Resting within the stem-opening and upon the top of the bulbstock Bis the cap 0, preferably of glass, circular, and provided with a groove adapted to contain the bead B. This cap is further provided with a central glass tube O, passing through and forming part thereof, and four or more platinum clasps D, fused into the cap and having its upper proj ecting end threaded and engaged by the copper semispherical nuts D. The clasps D D, which are in sets of twos, are provided with sliding collars D and adapted to clamp the carbon filaments E, as shown. The cap Ois adapted to nicely fit into the stem and upon the stock B.

F represents a two part tubular springmetal sleeve either of sheet or cast metal, each half being provided at the upper end with an outwardly-extending circumferential groove, at the lower end with an inwardlyextending flange F and an interior and exterior screw-thread slightly larger than the stock B, which it encompasses, the flange F clasping the stock below, as shown. Surrounding the stock B is a packing-collar H, of any suitable material to insure a snug and air-tight fit. This two-part sleeve is held upon the lamp-stock by means of the interior threaded stub'sleeve H, encompassing the sleeve F and binding it upon the stock. Upon the interior I provide a collar I, engaging the interior thread of the sleeve F, which works upon the cap 0 and firmly secures the lampstock to the sleeve-flange F. This arrangement of instrumentalities would embrace a lamp embodying my invention. There would be two sets of carbons within the lamp, both of which could be used at one time, or when one had been consumed the remaining projecting spherical electrodes could be brought within the circuit. WVhen this second carbon had been consumed, they could be replaced by taking the lamp apart, inserting new car bons within the clamps, and reassembling the parts, as has been described. Through this arrangement the bulbs could again be used, so that there would be no loss, probably, but that of the carbon.

The bulbs are exhausted by means of the glass tube 0 after they have been made airtight, according to any of the well-known methods.

In Fig. 2 I show more clearly the arrangement of a socket adapted to be used in conjunction with my lamp.

K represents the socket proper, preferably of sheet metal, provided with an outwardlyextending groove K and upon the interior with the two cross-pieces L L, of any suitable non-conducting material. Working within the lower brace L are the two similar arms M M, of metal, provided with the lower stock N, having a cavity adapted to accommodate the spherical nuts D. These arms are secured to the disk 0, of non-conducting material, which latter is secured to the lower brace L by means of the spring P, so that the arms are insulated and permitted a movement by virtue of the spring P. Fixed within the brace L are the two J-shaped spring-arms R R, by means of which the lamp is brought within a circuit. Each arm receives one of the conductors. Pivotally disposed between these spring-arms is the key S, which when brought into its horizontal position forces the springarms R R against the stems M M, and as these are in contact with the carbons when the lamp is in the socket bring the lamp within the circuit.

The sleeve F is detachably secured to the socket K, the spring actuated arms M M tightly binding upon the nuts D, as shown in Fig. 1. To bring the second carbon into use, it is simply necessary to turn the lamp ninety degrees, so as to bring the remaining nuts in contact with the arms M M.

The device is susceptible of several modifications, and in Fig. 6 I have shown a lampstock having an exterior thread blown upon it, as well as being provided with a corrugated cap. If desired, a thin sheet of lead might be placed between this cap and the stock, so as to insure an air-tight connection.

Having thus described my said invention, whatI claim as new, and desire to secure by United States Letters Patent, is

1. An incandescent pear-shaped lamp pro vided with a stem-opening and a flanged stock, the combination of a cap adapted to fit within and upon said opening and stock, said cap being provided with a central tube and four or more projecting threaded carbon clamps, semispherical nuts upon said clamps, carbons removably held within said clamps, an interior and exterior threaded sleeve surrounding said lamp-stock, a stub-sleeve encompassing it, and a threaded collar within said sleeve to secure said sleeve and stock,

all substantially as and for the purpose set forth.

2. A11 incandescent lamp provided with a stem-opening and a flanged stock, a cap adapted to fit within and upon said stock, provided with a central tube and two or more projecting clamps of carbon, said cap and lamp forming an air-tight seal, and a threaded springsleeve secured to said stock, in combination with a socket comprising the shell K, the spring-actuated contact-arms M M, adapted to be in electrical connection with said carbon clamps, the J-shaped spring-arms, and the key S, all arranged substantially as and for the purpose set forth.

3. In an incandescent lamp of a suitable configuration, provided with a stem-opening and a flanged stock 13, the cap 0, adapted to fit within and upon said opening and stock and provided with the central tube 0, the projecting carbon clamps D, provided with the nuts D, the spring-sleeve F, provided with an outwardly-extending groove at its upper and an inwardly-extending flange at its lower end, the lower portion of said sleeve being further interiorly and exteriorly threaded, the sleeves H, and collar I, in combination with a socket, comprising the shell K, the spring-actuated contact-arms M M, adapted to be in electrical connection with said carbon clamps D D, the J-shaped spring-arms, and the key S, all arranged substantially as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

EUGENE W. APPLEGATE.

Witnesses:

ARTHUR G. Row, J. A. BLACK. 

